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void separateMethod(String fname){
    String op='';
    List<string> chars = fname.split('');
    //List<Integer> cp=new List<integer>();
    For(integer i=0; i < chars.size();i++){
        op=op+chars.get(i) +' ';
    }
        
    system.debug('op:'+op);
}

separateMethod('w3school');